Line a baking tray with parchment or silicone paper. Break up the chocolate
and put into a heatproof bowl. Place inside a larger bowl of just-boiled
water (or over a pan of simmering water). Leave, stirring from time to time,
until melted. Cool slightly. Stir in about one-third of the peanuts and
raisins. Carefully pour on to the tray, then use a palette knife to spread